There is no direct answer to that without knowing the structure of your application, e.g. by spying your application or having a Ranorex snapshot (not screenshot) of the application. If the "4.0.0" link is the first and the "6.0.0" element the third child of the LinkTrTag element, than Children[2] might work, but that is only a guess!

Why don't you just use Ranorex Spy to spy the "6.0.0" link and get the corresponding RxPath or repository item, respectively?

I got the id from Ranorex spy itself. I can get id and go further.
But the thing is daily those versions get appended like 6.0.0 today 7.0.0 tomorrow..like that
I can't hard code directly or change the link daily in my code. I want the code to be generic and dynamic. So that's the reason i took the Trtag as the id for 6.0.0 which is common and to which these links get added.

That's the reson written the above code. I even tried with Children[2], but was clicking on the second row(labeled as "Last Write") and first column .

That (according to the picture) looks like just a basic HTML table. Can you not just get the table object then iterate, using the DOM, through each cell and get the aTag links?

If it is just an HTML document try (along with using Spy) using the IE Developer Toolbar for IE7 or the built in Developer Tools in IE8. Each has a DOM Inspector that you can traverse your web docs through the DOM and determine access to each item.